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Gefitinib induces apoptosis in HeLa and Siha cells. Cell apoptosis was examined by flow cytometry in (A) HeLa and (B) Siha cells following treatment with gefitinib. The relative protein expression levels of Bcl-2 and Bax were determined by western blot analysis in (C) HeLa and (D) Siha cells following treatment with gefitinib. *P<0.05, **P<0.01 and ***P<0.001 vs. control. Con, control.
